Longer code-phrases actually give the voice recognition system lower probability of false positives and false negatives. Additionally, the code phrase needs to

Longer code-phrases actually give the voice recognition system lower probability of false positives and false negatives. Additionally, the code phrase needs to be something slightly obscure right now; you don't want the machine triggering every time you walk through the front door and yell "Honey, I'm home! How was your day?"